diff --git a/backend/seeders/05-bullpens.js b/backend/seeders/05-bullpens.js
new file mode 100644
index 0000000..b6ebf91
--- /dev/null
+++ b/backend/seeders/05-bullpens.js
@@ -0,0 +1,83 @@
+const process = require('process');
+const {createPlayer, createUsers} = require("../helper/seeder.helper");
+
+const createBullpen = async (queryInterface, demoPlayer) => {
+    const startDate = new Date();
+    const endDate = new Date(new Date().setTime(startDate.getTime() + 10 * 60000));
+    const bullpens = [...Array(20).keys()].map(key => {
+        return {
+            pitcherId: demoPlayer.user.id,
+            startedAt: new Date(new Date().setDate(startDate.getDate()-5)),
+            finishedAt: new Date(new Date().setDate(startDate.getDate()-5)),
+            createdAt: new Date(),
+            updatedAt: new Date()
+        }
+    })
+    await queryInterface.bulkInsert('BullpenSessions', bullpens);
+
+    const pitchTypeIds = await queryInterface
+        .select(null, 'PitchTypes')
+        .map(pitchType => pitchType.id);
+
+    // red: 21-28
+    // orange: 11-18:
+    // green: 1-9
+    const bullpenChart = [
+        [21,22,23,24,25,26,27,28],
+        [11,12,13,14,15,16,17,18],
+        [1,2,3,4,5,6,7,8,9]
+    ]
+
+    const dbBullpens = await queryInterface.select(null, 'BullpenSessions', {
+        where: {
+            pitcherId: demoPlayer.user.id
+        }
+    });
+
+    [...Array(20).keys()].map(key => {
+        return {
+            pitchTypeId: pitchTypeIds[Math.floor(Math.random() * pitchTypeIds.length)],
+            pitchTime: new Date(2025, 3, 22, 16, 7, 21),
+            aimedArea: 11,
+            hitArea: 12
+        }
+
+    });
+}
+
+/** @type {import('sequelize-cli').Migration} */
+module.exports = {
+    async up (queryInterface, /*Sequelize*/) {
+        if (process.env.NODE_ENV !== 'development') return;
+
+        const roles = await queryInterface.select(null, 'Roles');
+        const players = [{
+            email: 'demo@bullpen.com',
+            password: 'demo$123',
+            firstName: 'Demo',
+            lastName: 'Player',
+            dateOfBirth: new Date(1975, 6, 19),
+            jerseyNumber: 33,
+            height: 187,
+            weight: 85,
+            gender: 'male',
+            bats: 'right',
+            throws: 'right',
+            state: 'active'
+        }];
+
+        const dbPlayers = await createPlayer(queryInterface, roles, players);
+        const demoPlayer = dbPlayers
+            .filter(player => player.user.auth.email === 'demo@bullpen.com').shift();
+
+        for (let i = 0; i < 10; ++i) {
+            createBullpen(queryInterface, demoPlayer);
+        }
+    },
+
+    async down (queryInterface, /*Sequelize*/) {
+        if (process.env.NODE_ENV !== 'development') return;
+
+        return;
+    }
+};